Margaret St. Clair (1911–1995) was an American science fiction and fantasy writer known for her imaginative stories, distinctive style, and exploration of social and philosophical themes. Writing under several names, she became an important figure in twentieth-century speculative fiction. Her works often combined futuristic ideas, mythology, psychology, and social commentary. St. Clair was admired for her originality, creativity, and ability to explore complex human questions through the lens of science fiction and fantasy.